Gauge length scriber



Sept. 29, 1970 v R. K. JOHNSON 3,530,588

GAUGE LENGTH SCRIBER F iled May 21; 1969 2 Sheets-Sheet 1 INVENTOR- RICHARD K. JOHNSON ATTORNEY Sept. 29, 1970 R. K. JOHNSON I GAUGE LENGTH SCRIBER 2 Sheets-Sheet 2 Filed May 21. 1969 United States Patent O 3,530,588 GAUGE LENGTH SCRIBER Richard Kent Johnson, 299 Pakachoag St., Auburn, Mass. 01501 Filed May 21, 1969, Ser. N 0. 826,379 Int. Cl. B43i 13/00 US. Cl. 33-21 3 Claims ABSTRACT OF THE DISCLOSURE A scriber, for test pieces especially, including a V block base with two spaced knives intersecting the Vs and a pivoted arm having rolls thereon in position to hold the test piece down onto the knives.

BACKGROUND OF THE INVENTION There have been many devices for providing indentations on test pieces by which the elongation of the test piece may be measured but an inaccuracy in the test results because of the fact that the material of the test piece is thus deformed. An example of such a device is shown in US. Pat. No. 3,164,008 dated Ian. 5, 1965. In this patent there are tools which provide actual indentations or deformations of the workpiece as clearly shown in FIG. of that patent.

In the present invention, this objection is obviated by means lightly scribing lines completely around or across a test piece by rotating the same in contact with a pair of sharp scribing knives.

SUMMARY OF THE INVENTION This invention provides a base having a pair of vertical spaced, parallel arms. A pair of sharp knives are supported on the base, one adjacent each arm and spaced by a calibrated measuring block (such as a Io-block) which holds the knives in position against the upright arm's. Each arm is provided at its top portion with a V notch, the knife edges intersecting these notches and the notches receiving in horizontal supported position thereon the test piece which lightly contacts the edges of the knives.

The base also pivotally mounts an arm overlying the knives and having a pair of rollers thereon to engage the surface of the test piece so that the latter is held in the position described and can be rotated either manually or 'by power so that the knife edges scribe very light, but clearly apparent marks about the surface of the test piece.

In addition there is a modification of the device in which the upright arms are turned inwardly over the measuring block so as to hold the test piece inboard of the scribing knives, the first described form of the device holding the test piece outboard of the scribing cutters.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view in side elevation with parts broken away and in section illustrating the invention;

FIG. 2 is a view in front elevation looking in the direction of arrow 2 in FIG. 1;

FIG. 3 is a top plan view looking in the direction of arrow 3 in FIG. 1; and

FIG. 4 is a view similar to FIG. 2 but showing a modification.

PREFERRED EMBODIMENT OF THE INVENTION A base generally indicated at has a floor 12, side walls 14 and if desired tabs 16 for securing the device to a workbench or table. At the forward ends of the walls 14 there are provided spaced, upright test piece support arms 18, each arm being provided with sloping surfaces 20, 20 and aligned intermediate or central V notches 22. The support arms 18 are generally parallel with respect to Y 3,530,588 Ice Patented Sept- 1970 each other as seen in FIG. 2 and accommodate a pair of scribing knives 24, 24 located therein by means of a measuring or gauge block 26 which of course has a predetermined length. Any members such as screws 28, 28 may be provided in the supporting arms 18, 18 for engaging the flat sides of the scribing knives 24 and clamping the same to the measuring block.

Each scribing knife is preferably in the form of a rectangular tool having a relieved sharpened edge at its top, these being indicated at 30, 30. These tools have heights greater than the height of the measuring block 26 whereby a test piece indicated at W may be merely set in the VS 22 of the support arms 18 and lightly engage the sharpened edges 30, 30 on the periphery thereof as is clearly shown in FIGS. 1 and 2.

The walls 14 of the base 10 are provided with a pivoted member 32 having an axis at 34 and spring-pressed to move in an opening or clockwise direction, FIG. 1, but being easily manually depressed. Adjacent the free edge portion 36 of the member 32 there are a pair of spaced, parallet rollers 38 which may be ball bearings, plastic rollers, or the like and these are conveniently mounted in lugs 40.

In the operation of the device the test piece W of conventional shape is merely set in the position shown where it has a vry slight engagement with respect to the sharpened edges 30 of the scribing knives 24. The pivoted arm 32 is brought down to engage rollers 38 with respect to the central portion of the test piece so that it cannot Wobble and then the test piece is rotated either by the fingers of the hand not holding the arm 32 or by any kind of mechanism which may be desired. A single rotation is sufficient to scribe annular lines around the test piece, and one of the advantages of the present invention besides preventing actual deformation of the material of the workpiece is to provide measuring lines which may be seen at any point on the circumference of the test piece.

Referring now to FIG. 4, the test base is indicated at 10', the measuring block at 26', the knives at 24 and the upright arms at 18'. The only difference between the showing in FIG. 4 and the showing in FIG. 2 resides in the fact that the arms 18' are pierced or slotted and bent over to a horizontal position as is indicated at 42, 42 and then again bent upwardly as at 44, 44. The ends 44, 44 are provided with the same V notches, etc., and otherwise the use and function is the same as previously recited. In the case of FIG. 4 however, smaller test pieces are accommodated and they are supported on the central portions of the test pieces rather than adjacent the ends.

I claim:

1. A gauge length scriber comprising a base, a pair of generally parallel spaced upright arms thereon at the ends thereof, corresponding notches at the upper ends of said arms for rotatably receiving a cylindrical test piece therebetween,

a pair of markers having scribing edges located in fixed position between said arms, said markers having portions intersecting the areas of the notches,

and a hold-down means for the test piece preventing dislodgment thereof, the test piece being capable of being rotated as supported in said notches and in contact with the markers,

a gauge block on the base between the arms, the markers being located between the ends of the block and a respective arm, and means on each arm to clamp the respective marker against the respective end of the gauge block.

2. The gauge length scriber of claim 1 wherein said test means hold-down means includes a pivoted arm, a pair of spaced rollers on parallel axes arranged on said pivoted arm to contact said test piece at two circumferentially spaced areas thereon between the markers.

References Cited UNITED STATES PATENTS 1,215,120 2/1917 Cramer 30-94 1,244,874 10/1917 Loughridge 30 94 Campaigne 3094 Mueller et a1. Toth et a1. 30164.9 X Forbes. Nielsen.

HARRY N. HAROIAN, Primary Examiner 

